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White Ash vs Blue Ash

White and blue ashes are sometimes confused where their ranges overlap, due to a similar leaf shape, but they are easily distinguished at any time of year by the winged, square stem of the blue ash, a feature that white ash lacks.

White Ash (Fraxinus americana)

Blue Ash (Fraxinus quadrangulata)

A tree species native to eastern North America, found on mesic sites in early to mid stages of forest succession.
A tree native to the midwest to central US, the blue ash is easily identified by its peculiar square stem.
Twigs and small branches are round and lack wings.
Photo © Charlie Inyo, CC BY 4.0.
Twigs and small branches are conspicuously square, with "wings" along the corners.
Photo © askalotl, Public Domain.